from tkinter import *

coords[10,10,
       20,10,
       20,20,
       30,20,
       30,40,
       20,40,
       30,20,
       30,10]

if N==0 and X <= 500 and Y<=500:
    pass
else:
    if N > 0 and 20*N+X>=0 and 20*N+Y>=0 and 0*N+X<=500 and 0*N+Y<=500:
        pass
    else:
        print('размер фигуры превышает максимальный размер')
        exit()

root = Tk()
root.title('ИТ марафон')
root.geometry(500x500)

canvas = Canvas(bg='whrite', width=500, height=500)
canvas.pack(anchor=CENTER, expand=1)

canvas.create_polygon(coords[0] *N+X, coords[1] *N+Y,
                      coords[2] *N+X, coords[3] *N+Y,
                      coords[4] *N+X, coords[5] *N+Y,
                      coords[6] *N+X, coords[7] *N+Y,
                      coords[8] *N+X, coords[9] *N+Y,
                      coords[10] *N+X, coords[11] *N+Y,
                      coords[12] *N+X, coords[13] *N+Y,
                      coords[14] *N+X, coords[15] *N+Y,)

root.mainloop()
